Circuit breaker



FIG. 1 is a front/right side/top perspective view of a circuit breaker, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a rear/top/left side perspective view thereof;

FIG. 9 is a bottom/rear perspective view thereof; and,

FIG. 10 is a top/rear perspective view thereof.

The broken line portions of the drawings are included to show unclaimed subject matter only, and form no part of the claimed design. 

The ornamental design for a circuit breaker, as shown and described. 